H j schneider



p 1940- H J. SCHNEIDER Re. 21,561

' 'STEAM GENERATOR Original Filed Feb. 14, 1935 2 Sheets-Sheet l Sept. 10, 1940. H. J. SCHNEIDER STEAM GENERATOR 2 Sheets-Sheet 2 Original Filed Feb. 14. 1955 Reissued Sept. 10, 1940 Re,

UNITED STATES PATENT OFFICE STEAM GENERATOR Henry J. Schneider, Quincy, Mass.

Original No. 2,028,925, dated January 28, 1936, Se-

rial No. 6,523, February 14, 1935. Application for reissue April 13, 1937, Serial No. 136,698

6Claims. (o1.122 s2s) My invention relates to that of steam genera- Each bank of water tubes I2-I3 provides a tors and more particularly to the type embodymultiplicity of innermost tubes I211 and I3a, ing a Yarrow boiler, and it consists in construcrespectively, in direct communication with the trons, arrangements and combinations herein products of combustion and an intermediate 5 described and claimed. multiplicity of tubes I22) and I3b. By this ar- 5 It is the object of the invention to provide a rangement, the tubes I2a and I3a by virtue of Yarrow type boiler with a radiant tube installadirect contact with the products of combustion tion arranged so as to increase the temperature will act to conduct a rapid transfer of heat beof feed water through the tubes, thus providing tween combustion gases and heated water to the a Steam generating u t to Obtain a higher t boiler 6 and the outermost tubes I2c and I3c will 10 fer of heat between combustion gases and heated act as convection tubes, permitting the unevapoflied Water with a comparatively Small t of rated water to gravitate from boiler 6 to the rehlgh fi yspective water drums I and 8, thus permitting a It is a further object of this invention to prorapid circulation of heated water between boiler 16 vide a steam. generating unit in which the steam 6 and water drums I and 8. Preferably, the tubes drum, water drums and tubes also a superheat comprising the banks I2 and I3 are varying in generator of a reliable type with a high output diameters, the largest being positioned adjacent have such a relationship to one another as to the greatest furnace heat as indicated at I2d readily permit building of an installation, in a and I3d. In order that advantage may be taken 2o comparatively small and compact unit and in of all possible heating area of combustion cham- 20 which practically all heat units are utilized in ber, the main feed water is fed through the inlets production of steam. I0 and II into respective closed extensions 38 and Additional objects, advantages and features of 39 thereof, the extensions being disposed in remy invention will be apparent from the followspective water drums 1-8. Connected with the ing description considered and in conjunction extensions .3839 there are spectively, water 25 with the accompanying drawings, wherein tubes I4 and IS. The tubes I4 and I5 extend Figure 1 is a side elevation embodying my indownwardly to occupy a position parallel with the vention. side walls of a fire-box and at a suitable point Figure 2 is a front elevation thereof. in the foundation of the steam generator, the

Figure 3 is in part the front elevation of the tubes I4I5 are bent, and extend varying dis- 30 enclosure with apertures for fuel injection and tances from their respective positions in the side in part showing the rear and outer wall water walls of a fire-box to apoint medially of the boiler tubes of my invention. and are thence abruptly bent and extended rear- Figure 4 is a sectional view on the line 4-4 of wardly toward the rear wall of combustion cham- Figure 1. her, where they are secured into a water-box I6. 35

Figure 5 is a sectional view on line 55 of The water tubes I4I5 thus provide awater wall Figure 3. and water floor which are covered with a suitable Referring to the drawings and particularly refractory material which will act as a conductor Figures 1 to 5 inclusive, there is illustrated a for heating feed water in tubes I4-I5 associated water and steamboiler 6, including an auxiliary with water drums I and 8 and water-box IS. The 40 feed water inlet 9. The boiler 6 may be of suitexterior of the water tubes I4I5 are covered able capacity and construction, and associated with a suitable heat resisting insulation. Herethere-with are water drums l and 8, including with I provide a secondary unit II which commain feed inlets Ill and II. The water drums I prises a multiplicity of U shaped tubes extending and 8 extend in a plane parallel with the boiler 6 forward at a suitable distance and secured into 45 but at a distance downwardly therefrom. In water-box I6. The water box I6 is longitudinally practice, the boiler '6 would occupy a position in divided by a wall Ifia defining the upper and the upper portion of a combustion chamber or lower chambers and the tubes I! are connected fire-box and the water drums I and 8 would be between the upper and lower chambers of waterpositioned in respective side walls of the fire-box. box IE, thereby permitting feed water to be 50 The boiler 6 and respective water drums I and 8 heated to a higher temperature due to circulation are interconnected by respective banks of water through tubes I'I. Tubes I'I will be covered on tubes I2 and I3, these tubes extending diagonally their top sides with a refractory material which inward over the firebox and enter boiler 6 upon has the quality of resisting clinker adhesion.

5; its under side. An opening H in the covering will be retained boiler G.

at each end, with an apron 40 over the front end of said refractory material to permit furnace heat to circulate thereunder. A multiplicity of tubes l8 are connected between water-box I6 and rear portion of the boiler 6, and these tubes I8 are directly exposed to furnace heat to further permit the heating of feed water. The tubes l8 open upon a box or chamber I!) so as to direct the feed water through the tubes I20 and Be which are connected with the box or chamber l9 and thence into water drums 1 and 8 as shown in Figures 1, 2, 3 and 5.

From the foregoing, it will be apparent that the feed water will pass through the inlets H] and II into the water drums I and 8 through tubes l4 and I5, and H, the Water-box l8, and thence through the tubes l8, chamber l9, and finally down through tubes l2c and I30 to water drums I and 8. The feed water has thus attained a high degree of temperature. Preferably between tubes l2b and I31) and l2a and l3a there is shown a space in which a superheater of any approved type may be installed, the tubes 23a. of said superheater extending parallel to those of the boiler 6 and water drums l and 8 to generate a higher degree of superheat, as clearly shown in Figure 1.

Steam is taken from the boiler 6 through a central outlet T valve 20 to which pipes 2! and 22 areassociated, the pipes being connected with respective superheaters 23 and 24. The common outlet header 25 may be connected to a delivery pipe not shown.

In Figure 1 a complete unit is shown and comprises a feed pump 26, a feed line 2'! and a heater 28 from which a pipe 38 extends for connection with the upper and lower chambers of the installation. The pipe 38 includes a T-fitting 32 establishing connection with a feed inlet II, and from one side of the fitting 3.2 there is a pipe 33, which is connected with an upper portion of a The pipe has installed therein a valve 3|, andthe pipe 33has a valve 34. The T- connection 29 provides for connection of a similar series of pipes and valves for the opposite drum 8, connection being made through fittings ll-42. and 43., as shown in Figure 3. In operation, normally, the valves 3| are open and the valves 34 are closed, but in emergency where an auxiliary feed is essential, the valves 34 are opened.

The boiler 6 is'connected to the drums 'l8 by suitable pipes 36, including elbow fittings 35-3l', these pipes being commonly known as downcomers.

Various constructions of water-boxes may be employed, but in Figure 1, I have shown a construction of preferred square type with a division plate lBa therein to define upper and lower chambers, the front and upper side of which is suitably apertured for reception of water tubes or similar tubes. By providing apertures on all sides of box IE numerous pipe connections may be made and those apertures which are not required in installation may be closed by use of any suitable plug.

I have found that the arrangement above described in which the top drum is centrally situated in the lower side walls of the combustion chamber, a complete unit comprising the water walls, water floors, and radiant tubes is provided having the advantage that it permits the raising of feed water temperature to a very high degree to a given: floor area, which is an important factor of marine installation.

The invention herein disclosed is in some aspects an improvement over that of my prior application, Serial No. 667,554, filed April 24, 1933, for Steam generators.

I claim:

1. A boiler comprising a substantially hori zontal upper chamber, two lower smaller substantially horizontal chambers defining the upper lateral boundaries of a fire-box, an inner bank of generating tubes connecting respective lower chambers to said upper chamber, and an outer bank of convection tubes connectingrespective lower chambers to said upper chamber, a multiplicity of water tubes extending downwardly from respective lower chambers and defining the sides of a water wall of the fire-box, water tubes communicating with the last named tubes arranged to form a water floor of the firebox, water tubes communicating with the last named tubes arranged to form a heater in the fire-box, water tubes communicating with the last named tubes arranged to define a back wall in the fire-box, and water tubes connected between said upper chamber and said two lower chambers arranged to define a water wall beyond the convection tubes and communicating with the tubes of said walls, floor, heater and boiler.

2. A boiler set forth in; claim 1, together with superheater elements intermediate the generating tubes and convection tubes.

3. A boiler comprising a substantially horizontal upper chamber, two lower smaller substantially horizontal chambers defining the upper lateral boundaries of a fire-box, an inner bank of generating tubes connecting respective lower chambers to said upper chamber, an outer. bank of convection tubes connecting respective lower chambers to said upper chamber, a multiplicity of water tubes extending downwardly from respective lower chambers and defining the sides of a water wall of a fire-box, water tubes communicating with last named tubes arranged to form a water floor of a fire-box, a water-box in communication with said last named tubes, a multiplicity of tubes in communication with said last named water-box to define a back waterwall, a water-box in the upper chamber in communication with said last named tubes, and a multiplicity of tubes in communication with said last named water-box and respective lower chambers defining the outer wall of convection tubes.

4. A boiler set forth in claim 1 wherein the generating tubes vary in diameter.

5. A boiler comprising a substantially horizontal upper chamber, two lower smaller substantially horizontal chambers defining the upper lateral boundaries of a fire-box, an inner bank of generating tubes connecting respective lower chambers to said upper chamber, an outer bank of convection tubes connecting respective lower chambers to said upper chamber, a multiplicity of water tubes extending downwardly from respective lower chambers and defining the sides of a water wall of a fire-box, water tubes communicating with last named tubes arranged to form a water floor of a fire-box, a water-box in communication with said last named tubes, a multiplicity of water tubes in communication with said last named water-box to define a back water wall of the fire-box, a water-box in the upper chamber in communication with said last named tubes, and an outer element of larger water pipes in communication with the water, walls of lower chambers and upper chamber.

6. A boiler comprising a substantially horizontal upper chamber, two lower smaller substantially horizontal chambers defining the upper lateral boundaries of a fire-box, an inner bank of generating tubes connecting respective lower chambers to said upper chamber, an outer bank of convection tubes connecting respective lower chambers to said upper chamber, a multiplicity of Water tubes extending downwardly from respective lower chambers and defining the sides of a water wall of a fire-box, water tubes communicating with last named tubes arranged to form a water floor of a fire-box, a water-box in communication with said last named tubes, a multiplicity of water tubes in communication with said last named water-box to define a water heater, a multiplicity of tubes in communication with said last named water-box t0 define a back water wall, a water-box in the upper chamber in communication with said last named tubes, feed water inlet pipes in communication with the lower chambers, and down-comer water pipes connected between the upper and lower chambers.

HENRY J. SCHNEIDER. 

